1. Drop in the Box Base and add as many Box Items Stacks as you want.

2. Add the pop up images and thumbnails using the Stacks HUD. Drop them in or find them using OS X Finder. Or, point to online images using the warehouse options. These images are 100% width so you'll need to size your intended size, but they are 100% responsive.

Re-order the images if you want and set the lightbox setting.

Stacks Image 29
4. Make any further adjustments like the thumb size, border colour, lightbox settings, amount of images and so on in the Stack settings.

Then PUBLISH your page!
Stacks Image 33

Setup your lightbox image grid using the FREE included responsive columns layout Stack like this:

Stacks Image 1302
Stacks Image 1310